This word originated in the Erd fictional universe where Steve the vagabond and others live
Avocadian (noun) (/ævə’keɪdiən/, or more rarely, /ɑ:və’kɑ:diən/)
Avocadian refers to people who are largely ignorant about language in general but still like to “inform” people about language. Some are rather belligerent in their ignorance and won’t accept any criticism or correction. It also describes any so-called “language troll” who is either trying to mislead, misdirect or misinform genuine language enthusiasts. This word is a pejorative for anyone who wishes to knowingly mislead people as to the true origins of words, terms and languages.
I joined the facebook group Omniglot Fan Club in late 2014. A few months after I joined, a guy came on the group and told us all that his language was the source and progenitor of all the languages in the world. We showed him that the similarities he was pointing out were because his language was related to the languages in his examples.
He wasn’t convinced, but the admins of the group were convinced of one thing, that he was spamming the group with multiple threads and he was banned. But he inspired many people in the group to continue the silliness and the next day, the group was in complete chaos with people trying to write the most bizarre things they could.
After a week of this, the admins got a bit annoyed and told us to knock it off. But a lot of us were having a lot of fun, so I decided to make a group that was dedicated to language silliness called “Developing the Atlantean Conlang” (I had previously suggested that all languages come from Atlantean, to counter the assertions of the guy who had originally asserted that his language was the source of all languages).
But once the group got going, it became clear that it was becoming more about constructed languages (languages that are created deliberately but can nonetheless operate perfectly well as actual usable languages) so I decided to make a new group for silly language stuff.
There have always been people on language groups who come on and try to give people a lesson on how thing “actually” work (but they don’t have a clue how things work, they just think they do). This annoyed me, so I decided that I should come up with a word to describe people like this.
So I thought back to the discussion we had with that original pseudo linguist on Omniglot. He had mistyped “advocate” as “avocat”. So I started calling people who tried to spread their pseudo linguist theories “avocadoists”. This quickly evolved into “avocadian”.